ByteBuffer getFloat() method in Java with Examples

Last Updated : 17 Jun, 2019

getFloat()

The getFloat() method of java.nio.ByteBuffer class is used to read the next four bytes at this buffer's current position, composing them into a float value according to the current byte order, and then increments the position by four. Syntax:

public abstract float getFloat()

Return Value: This method returns the float value at the buffer's current position. Exception: This method throws BufferUnderflowException if there are fewer than four bytes remaining in this buffer. Below are the examples to illustrate the getFloat() method: Examples 1:

Java

// Java program to demonstrate
// getFloat() method

import java.nio.*;
import java.util.*;

public class GFG {

    public static void main(String[] args)
    {

        // Declaring the capacity of the ByteBuffer
        int capacity = 8;

        // Creating the ByteBuffer
        try {

            // creating object of ByteBuffer
            // and allocating size capacity
            ByteBuffer bb = ByteBuffer.allocate(capacity);

            // putting the double value in the bytebuffer
            bb.asFloatBuffer()
                .put(12.3f)
                .put(28.44f);

            // rewind the Bytebuffer
            bb.rewind();

            // print the ByteBuffer
            System.out.println("Original ByteBuffer: ");
            for (int i = 1; i <= capacity / 4; i++)
                System.out.print(bb.getFloat() + " ");

            // rewind the Bytebuffer
            bb.rewind();

            // Reads the Float at this buffer's current position
            // using getFloat() method
            float value = bb.getFloat();

            // print the float value
            System.out.println("\n\nByte Value: " + value);

            // Reads the  float at this buffer's next position
            // using getFloat() method
            float value1 = bb.getFloat();

            // print the float value
            System.out.print("\nNext Byte Value: " + value1);
        }

        catch (BufferUnderflowException e) {

            System.out.println("\nException Thrown : " + e);
        }
    }
}

Output:

Original ByteBuffer: 
12.3 28.44 

Byte Value: 12.3

Next Byte Value: 28.44

Examples 2:

Java

// Java program to demonstrate
// getFloat() method

import java.nio.*;
import java.util.*;

public class GFG {

    public static void main(String[] args)
    {

        // Declaring the capacity of the ByteBuffer
        int capacity = 8;

        // Creating the ByteBuffer
        try {

            // creating object of ByteBuffer
            // and allocating size capacity
            ByteBuffer bb = ByteBuffer.allocate(capacity);

            // putting the double value in the bytebuffer
            bb.asFloatBuffer()
                .put(12.3f)
                .put(28.44f);

            // rewind the Bytebuffer
            bb.rewind();

            // print the ByteBuffer
            System.out.println("Original ByteBuffer: ");
            for (int i = 1; i <= capacity / 4; i++)
                System.out.print(bb.getFloat() + " ");

            // rewind the Bytebuffer
            bb.rewind();

            // Reads the Float at this buffer's current position
            // using getFloat() method
            float value = bb.getFloat();

            // print the float value
            System.out.println("\n\nByte Value: " + value);

            // Reads the  float at this buffer's next position
            // using getFloat() method
            float value1 = bb.getFloat();

            // print the float value
            System.out.println("\nNext Byte Value: " + value1);

            // Reads the  float at this buffer's next position
            // using getFloat() method
            float value2 = bb.getFloat();
        }

        catch (BufferUnderflowException e) {
            System.out.println("\nthere are fewer "
                               + "than eight bytes remaining"
                               + " in this buffer");
            System.out.println("Exception Thrown : " + e);
        }
    }
}

Output:

Original ByteBuffer: 
12.3 28.44 

Byte Value: 12.3

Next Byte Value: 28.44

there are fewer than eight bytes remaining in this buffer
Exception Thrown : java.nio.BufferUnderflowException

Reference: https://docs.oracle.com/javase/9/docs/api/java/nio/ByteBuffer.html#getFloat--

getFloat(int index)

The getFloat(int index) method of java.nio.ByteBuffer is used to read four bytes at the given index, composing them into a float value according to the current byte order. Syntax:

public abstract float getFloat(int index)

Parameters: This method takes index as parameter which is the index from which the Byte will be read. Return Value: This method returns the float value at the given index. Exception: This method throws IndexOutOfBoundsException if index is negative or not smaller than the buffer’s limit. Below are the examples to illustrate the getFloat(int index) method: Examples 1:

Java

// Java program to demonstrate
// getFloat() method

import java.nio.*;
import java.util.*;

public class GFG {

    public static void main(String[] args)
    {

        // Declaring the capacity of the ByteBuffer
        int capacity = 8;

        // Creating the ByteBuffer
        try {

            // creating object of ByteBuffer
            // and allocating size capacity
            ByteBuffer bb = ByteBuffer.allocate(capacity);

            // putting the double value in the bytebuffer
            bb.asFloatBuffer()
                .put(12.3f)
                .put(28.44f);

            // rewind the Bytebuffer
            bb.rewind();

            // print the ByteBuffer
            System.out.println("Original ByteBuffer: ");
            for (int i = 1; i <= capacity / 4; i++)
                System.out.print(bb.getFloat() + " ");

            // rewind the Bytebuffer
            bb.rewind();

            // Reads the Float at this buffer's current position
            // using getFloat() method
            float value = bb.getFloat(0);

            // print the float value
            System.out.println("\n\nByte Value: " + value);

            // Reads the  float at this buffer's next position
            // using getFloat() method
            float value1 = bb.getFloat(4);

            // print the float value
            System.out.println("\nNext Byte Value: " + value1);
        }

        catch (IndexOutOfBoundsException e) {

            System.out.println("\nindex is negative or smaller"
                               + " than the buffer's limit, "
                               + "minus seven");
            System.out.println("Exception Thrown : " + e);
        }
    }
}

Output:

Original ByteBuffer: 
12.3 28.44 

Byte Value: 12.3

Next Byte Value: 28.44

Examples 2:

Java

// Java program to demonstrate
// getFloat() method

import java.nio.*;
import java.util.*;

public class GFG {

    public static void main(String[] args)
    {

        // Declaring the capacity of the ByteBuffer
        int capacity = 8;

        // Creating the ByteBuffer
        try {

            // creating object of ByteBuffer
            // and allocating size capacity
            ByteBuffer bb = ByteBuffer.allocate(capacity);

            // putting the double value in the bytebuffer
            bb.asFloatBuffer()
                .put(12.3f)
                .put(28.44f);

            // rewind the Bytebuffer
            bb.rewind();

            // print the ByteBuffer
            System.out.println("Original ByteBuffer: ");
            for (int i = 1; i <= capacity / 4; i++)
                System.out.print(bb.getFloat() + " ");

            // rewind the Bytebuffer
            bb.rewind();

            // Reads the Float at this buffer's current position
            // using getFloat() method
            float value = bb.getFloat(0);

            // print the float value
            System.out.println("\n\nByte Value: " + value);

            // Reads the  float at this buffer's next position
            // using getFloat() method
            float value1 = bb.getFloat(6);

            // print the float value
            System.out.println("\nNext Byte Value: " + value1);
        }

        catch (IndexOutOfBoundsException e) {

            System.out.println("\nindex is negative or"
                               + " smaller than the buffer's "
                               + "limit, minus seven");
            System.out.println("Exception Thrown : " + e);
        }
    }
}

Output:

Original ByteBuffer: 
12.3 28.44 

Byte Value: 12.3

index is negative or smaller than the buffer's limit, minus seven
Exception Thrown : java.lang.IndexOutOfBoundsException

Reference: https://docs.oracle.com/javase/9/docs/api/java/nio/ByteBuffer.html#getFloat-int-